Back Known-Plaintext-Angriff German حمله متن آشکار Persian Attaque à texte clair connu French התקפת גלוי-ידוע HE Attacco con testo in chiaro noto Italian 既知平文攻撃 Japanese 기지 평문 공격 Korean Atak ze znanym tekstem jawnym Polish Атака на основе открытых текстов Russian Known-plaintext attack SIMPLE
The known-plaintext attack (KPA) is an attack model for cryptanalysis where the attacker has access to both the plaintext (called a crib) and its encrypted version (ciphertext). These can be used to reveal secret keys and code books. The term "crib" originated at Bletchley Park, the British World War II decryption operation, where it was defined as:
A plain language (or code) passage of any length, usually obtained by solving one or more cipher or code messages, and occurring or believed likely to occur in a different cipher or code message, which it may provide a means of solving.[1][2]
- ^ Gordon Welchman, The Hut Six Story: Breaking the Enigma Codes, p. 78.
- ^ Michael Smith, "How It Began: Bletchley Park Goes to War," in B. Jack Copeland, ed., Colossus: The Secrets of Bletchley Park's Codebreaking Computers.